Acetyl-COA-carboxylase from Candida albicans

ABSTRACT

The Acetyl-COA-carboxylase (ACCase) gene from  Candida albicans.

This application is the national phase of international application PCT/GB98/03857 filed Dec. 21, 1998 which designated the U.S.

The present invention relates to Acetyl-COA-carboxylase (ACCase) genes from Candida Albicans (C. albicans) and methods for its expression. The invention also relates to novel hybrid organisms for use in such expression methods.

C. albicans is an important fungal pathogen and the most prominent target organism for antifungal research. ACCase is an enzyme of fatty acid biosynthesis and essential for fungal growth and viability. Inhibitors of the ACCase enzyme should therefore be potent antifungals. The ACCase proteins in all organisms are homologous to each other but they also differ significantly in the amino acid sequence. Because selectivity problems (for example fungal versus human) it is extremely important to optimise potential inhibitor leads directly against the target enzyme (C. albicans) and not against a homologous but non-identical model protein, for example from Saccharomyces cerevisiae (S. Cerevisiae).

We have now successfully cloned the ACCase gene from C. albicans (hereinafter referred to as the C. Albicans ACC1 gene) and elucidated its full length DNA sequence and corresponding polypeptide sequence, as set out in FIGS. 4 and 5 of this application respectively. The coding DNA sequence of the C. Albicans ACC1 gene is 6810 nucleotides in length and the corresponding protein sequence is 2270 amino acids in length. As will be explained below there are two forms of the C. Albicans ACC1 gene, the above numbers relate to the longer version, Met1.

Therefore in a first aspect of the present invention we provide a polynucleotide encoding a C.albicans ACCase gene, in particular the (purified) C. albicans ACC1 gene as set out in FIG. 5 hereinafter. It will be appreciated that the polynucleotide may comprise any of the degenerate codes for a particular amino acid including the use of rare codons. The polynucleotide is conveniently as set out in FIG. 4. It will be apparent from FIG. 4 that the gene is characterised by the start codons Met1 and Met2 (as indicated by the first and second underlined at codons, hereinafter referred to as atg1 and atg2 respectively). Both forms of the gene starting from Met1 and Met2 respectively are comprised in the present invention. The invention further comprises convenient fragments of any one of the above sequences. Convenient fragments may be defined by restriction endonuclease digests of sequence, suitable fragments include a full length C. Albicans ACC1 gene (starting with Met1 or Met2) flanked by unique Stu1 (5′-end)-NotI (3′-end) restriction sites as detailed in FIG. 6.

We also provide a polynucleotide probe comprising any one of the above sequences or fragments together with a convenient label or marker, preferably a non-radioactive label or marker. Following procedures well known in the art, the probe may be used to identify corresponding nucleic acid sequences. Such sequences may be comprised in libraries, such as cDNA libraries. We also provide RNA transcripts corresponding to any of the above C. Albicans ACC1 sequences or fragments.

In a further aspect of the invention we provide a C. albicans ACC1 enzyme, especially the ACC1 enzyme having the polypeptide sequence set out in FIG. 5, in isolated and purified form. This is conveniently achieved by expression of the coding DNA sequence of the C. Albicans ACC1 gene set out in FIG. 4, using methods well known in the art (for example as described in the Maniatis cloning manual—Molecular Cloning: A Laboratory Manual, 2^(nd) Edition 1989, J. Sambrook, E. F. Fritsch & Maniatis). As indicated for FIG. 4 above, the enzyme is characterised by two forms Met1 and Met2. Both form of the enzyme are comprised in the present invention.

The C. Albicans ACC1 enzyme of the present invention is useful as a target in biochemical assays. However, to provide sufficient enzyme for a biochemical assay for C. Albicans ACC1 (for example, for a high throughput screen for enzyme inhibitors) this has to be purified. Two major constraints impair this purification.

1) any new organism will necessitate deviation from published procedures because it will differ in its lysis and protease activity. C. albicans is known to express and secrete many aspartyl proteases.

2) The expression of C. Albicans ACC1 is very low and satisfying purification results can only be achieved if the enzyme is overexpressed.

We have now been able to overcome these problems by controlled overexpression of the C. albicans ACC1 in a Saccharomyces strain. This means that subsequent purification of the enzyme may then for example follow published procedures.

Therefore in a further aspect of the present invention we provide a novel expression system for expression of a C. albicans ACC1 gene which system comprises an S. cerevisiae host strain having a C. albicans ACC1 gene inserted in place of the native ACC1 gene from S. Cerevisiae, whereby the C. albicans ACC1 gene is expressed. Preferred S. cerevisiae strains include JK9-3Daα and its haploid segregants.

The C. albicans ACC1 gene is preferably over-expressed relative to that as may be achieved by a C. albicans wild type strain, ie under the control of its own ACC1 promoter. Whilst we do not wish to be bound by theoretical considerations, we have achieved approximately 14 fold over-expression relative to the wild-type host S. cervisiae strain JK9-3D. This may be achieved by replacing the C. albicans promoter in the expression construct by a stronger and preferably inducible promoter such as the S. cerevisiae GAL1 promoter.

Controlled overexpression is used to improve expression of a C. albicans polypeptide relative to expression under the control of a C. albicans promoter. In addition using procedures outlined in the accompanying examples we have been able to isolate a fully functional C. albicans ACC1 gene as determined by 100% inhibition by SoraphenA.

The novel expression system is conveniently prepared by transformation of a heterozygous ACC1 deletion strain of a convenient S. cerevisiae host by a convenient plasmid comprising the C. albicans ACC1 gene. Transformation is conveniently effected using methods well known in the art of molecular biology (Ito et al. 1983).

The plasmid comprising the C. albicans ACC1 gene and used to transform a convenient S. cerevisiae host represents a further aspect of the invention. Preferred plasmids for insertion of the C. Albicans ACC1 gene include YEp24, pRS316 and pYES2(Invitrogen).

The heterozygous ACC1 deletion strain of a convenient (diploid) S. cerevisiae host is conveniently achieved by disruption preferably using an antibiotic resistance cassette such as the kanamycin resistance cassette described by Wach et al (Yeast, 1994, 10, 1793-1808).

The expression systems of the invention may be used together with, for example cell growth and enzyme isolation procedures identical to or analogous to those described herein, to provide an acetyl-COA-carboxylase (ACCase) gene from C. albicans in sufficient quantity and with sufficient activity for compound screening purposes.

In a further aspect of the invention we provide the use of an acetyl-COA-carboxylase (ACCase) gene from C. albicans in assays to identify inhibitors of the polypeptide. In particular we provide the their use in pharmaceutical or agrochemical research.

As presented above the C. albicans ACC1 enzyme may be used in biochemical assays to identify agents which modulate the activity of the enzyme. The design and implementation of such assays will be evident to the biochemist of ordinary skill. The enzyme may be used to turn over a convenient substrate whilst incorporating/losing a labelled component to define a test system. Test compounds are then introduced into the test system and measurements made to determine their effect on enzyme activity. Particular assays are those used to identify inhibitors of the enzyme useful as antifungal agents. By way of non-limiting example, the activity of the ACC1 enzyme may be determined by (i) following the incorporation (HCO₃, Acetyl-CoA) or loss (ATP) of a convenient label from the relevant substrate (T. Tanabe et al, Methods in Enzymology, 1981, 71, 5-60; M. Matasuhashi, Methods in Enzymology, 1969, 14, 3-16), (ii) following the release of inorganic phosphate from ATP (P. Lanzetta et al, Anal. Biochem. 1979, 100, 95-97), or (iii) following the oxidation of NADH in a coupled assay, for example using either fatty acid synthetase or pyruvate kinase/lactate dehydrogenase enzymes. Convenient labels include carbon14, tritium, phosphorous32 or 33.

Any convenient test compound(s) or library of test compounds may be used. Particular test compounds include low molecular weight chemical compounds (molecular weight less than 1500 daltons) suitable as pharmaceutical agents for human, animal or plant use.

The enzyme of the invention, and convenient fragments thereof may be used to raise antibodies. Such antibodies have a number of uses which will be evident to the molecular biologist of ordinary skill. Such uses include (i) monitoring enzyme expression, (ii) the development of assays to measure enzyme activity and precipitation of the enzyme.

In addition we provide antisense polynucleotides specific for all or a part of an ACC1 polynucleotide of the invention.

The invention will now be illustrated but not limited by reference to the following Table, Example, References and Figures wherein:

Table 1 shows the comparative properties of native and recombinant acetyl-CoA carboxylase enzymes

FIG. 1 shows a partial sequence (SEQ ID NO:1) from the C. albicans genome. Underlined regions were used to derive PCR primers, to generate a C. Albicans ACC1 specific probe.

FIG. 2 shows cloned fragments of the C. albicans ACC1 gene isolated from genomic DNA libraries. Arrows indicate extension of the fragment beyond the region displayed.

FIG. 3 shows sequenced XbaI-HinDIII and HinDIII subclones of clone CLS1-b1.

FIG. 4 shows the full DNA sequence (SEQ ID NO:2) of the C. albicans ACC1 gene. The atg start codons for Met1 and Met2 are in lower case and underlined, as is the tag stop codon.

FIG. 5 shows the full protein sequence (SEQ ID NO:3) of the C. albicans ACC1 gene. Putative start codons for Met1 and Met2 are shown in bold.

FIG. 6 shows the generation of a tailored ACC1 gene (minus promoter) for expression under control of the GAL1 promoter in plasmid pYES2. From the initial ACCase gene (line1) the core SacI-BamHI (line3) is modified by the addition of 3′ BamHI-NotI (line2) and 5′ StuI-SacI (different fragments for Met1 and -2 lines 5 and 7 respectively) to generate the final “portable” gene flanked by StuI-NotI (lines 6 and 8).

FIG. 7 shows the results of the in-vitro ACCase enzyme assay set out in the accompanying Example when Soraphen A (a specific inhibitor of the ACCase enzyme) was supplied (X-axis) over the range 0.1 nM-100 μM in the dose response regimen of the assay.

EXAMPLE 1

Cloning of the C. albicans ACC1 gene and generation of a heterologous S. cerevisiae expression system:

1) Probe Generation

We used the polymerase chain reaction (PCR) to generate a DNA probe between and including the underlined regions in FIG. 1

2) Identification of Clones from a C. albicans Genomic Library Hybridising to the ACCase Probe

The PCR product was labelled using an “ECL direct nucleic acid labelling and detection kit” (Amersham) as described by the supplier. The PCR product (probe) was then shown to hybridise to S. cerevisiae (weakly) and C. albicans genomic DNA. in a Southern blot procedure (as described Maniatis, 1989). Two genomic DNA libraries (CLS1 and CLS2) of C. albicans (in the yeast-E. coli shuttle plasmids YEp24 and pRS316 respectively, (as described in Sherlock et al. 1994, source: Prof. John Rosamond, Manchester University) were used to isolate fragments hybridising with the probe which was radiolabelled using “Ready To Go” dCTP labelling beads (Pharmacia, as described by the manufacturer). The colony hybridisation was carried out as described by Maniatis (1989). Hybridising colonies were identified, plasmid DNA isolated, purified (Quiagen maxiprep, as described by the supplier) and sequenced (Applied Biosystems, model 377 sequencer) from their junctions with the plasmid. Several fragments carrying partial ACCase gene sequence as well as one full length clone could be identified (FIG. 2).

3) Sequencing of the Cloned Gene, Comparison with ACCases from S. cerevisiae, Other Fungi and Higher Eukaryotes (Plants, Mammals, Man)

The bulk of the sequence of the C. albicans ACC1 gene was determined (on both strands) using flanking sequence- or insert sequence-specific primers from defined HinDIII and XbaI-HinDIII subfragments (of clone CLS1-b1) cloned into pUC19 (see FIG. 4). The promoter and 5′ coding region absent from this clone was established from CLS2-d1 and the gene's 3′ end from CLS2-13 using insert specific primers. All junctions including the ones between the HinDIII subfragments were verified from the full length clone CLS2-13 (in Yep24. The full length DNA sequence of C. albicans (Ca) ACC1 is shown in FIG. 5a and the protein translation in FIG. 5b. The two potential start Methionines, Met1 and Met2 are shown in bold

The protein is homologous to ACCases of other fungi (S. cerevisiae, S. pombe and U maydis) and also to the plant (Brassica napus), mammalian (sheep, chicken and rat) and human enzymes. Of the two potential start codons of C. albicans ACC1, Met 2 seems the more likely one as the sequence between Met1 and Met2 is unrelated to the other ACCases and indeed to any other protein sequence in the EMBL/Genbank database. The high degree of homology between ACCases of different species and the apparent lack of an identifiable fungal subgroup makes it even more important to use the actual target enzyme (here from the pathogen C. albicans) as a screening tool to identify specific inhibitors.

4) Generation of a Heterozygous ACC1 Deletion Strain of S. cerevisiae

As ACCase is an essential enzyme, only one allele of a diploid cell can be deleted without loss of survival. One ACC1 gene of a diploid S. cerevisiae strain (JK9-3Daa, Kunz et al. 1993) was therefore disrupted using the kanamycin resistance cassette as described by Wach et al. using the protocol described therein. Sporulation of the heterozygous diploid (ACC1/acc1::KANMx) yields only two viable spores (which are kanamycin-sensitive) showing the essentiality of the ACC1 gene as well as the characteristic arrest phenotype for the two inviable spores (as published by Hallacher et al., 1993).

5) Complementation of a S. cerevisiae ACC1 Deletion with the Cloned Candida Gene, Ca ACC1

The heterozygous ACC1/acc1::KANMx strain was transformed with one full length C. albicans gene (CLS2-13 in Yep24). Expression of the gene from this plasmid will be due to functionality of the Candida ACC1 promoter in the heterologous S. cerevisiae system. Complementation of the knockout was demonstrated by sporulating the diploid transformants. In most cases 3-4 viable (haploid) spores were detected. The analysis of tetrads indicated that kanamycin-resistant colonies were only formed if they also contained the complementing CLS2-13 plasmid, as indicated by the presence of the URA3 transformation marker. This clearly shows that the C. albicans gene fully complements the ACCase function in S. cerevisiae. Therefore the strain generated can be used to screen for inhibitors which are specific for the Candida enzyme in the absence of a background of Saccharomyces enzyme. As demonstrated by its functionality, the heterologous protein folds correctly in the host, S. cerevisiae, where it must also have been correctly biotinylated by the S. cerevisiae machinery (carried out by ACC2, encoding protein-biotin-ligase).

To facilititate purification of C. albicans ACCase, it is beneficial to achieve overexpression of the protein in a suitable host. Therefore the C. albicans promoter was replaced by the stronger and inducible S. cerevisiae GAL1 promoter. As the Candida sequence had revealed two potential start codons (see FIG. 4) for the ACC1 reading frame, both versions were placed under GAL1 control. To generate appropriate restriction sites for cloning, the ACC1 gene was modified via PCR at both ends (see FIG. 6 above). and cloned into plasmid pYES2 (Invitrogen) as a StuI-NotI fragment into HinDIII (fill-in)-NotI sites of the vector. The identity of the PCR-modified gene-parts with the original ones was confirmed by sequencing. Both constructs (Met1 and Met2) complement the S. cerevisiae ACC1 knockout when the cells are grown on galactose but not on glucose (where the GAL1 promoter is switched off). Growth is very poor if the gene is transcribed initiating at Met1, whereas Met2 restores wild type growth rates in S.cerevisiae.

6) Overexpression of the Ca ACCase to Facilitate Protein Purification and use for Screening Purposes

Materials

Growth Media:

Sabouraud Dextrose broth

Yeast peptone dextrose broth (YPD)

Yeast peptone galactose broth (YPGal) (i.e. 2% w/v galactose)

Growth of Cells

Candida albicans B2630 (Janssen Pharmaceutica, Beerse, Belgium) was maintained on Sabouraud dextrose agar slopes at 37° C. which were subcultured biweekly. For the growth of liquid cultures for experiments, C. albicans grown on Sabourauds dextrose agar for 48 h at 37° C. was used to inoculate 50 ml Sabouraud dextrose broth containing 500 μg/l d-biotin. This was incubated for 16 h at 37° C. on a platform shaker (150 rpm). 1.5 ml of this culture was added to each of 24×2 litre conical flasks, each containing 1 litre of Sabouraud dextrose broth containing 500 μg/l d-biotin, giving a final inoculum concentration of approximately 1.5×10⁶ cfu ml⁻¹. The cultures were grown for 9 h, at 37° C. (log phase) with shaking (150 rpm). Cell numbers in liquid culture were determined spectrophotometrically (Philips PU8630 UV/VIS/NIR Spectrophotometer) at 540 nm in a 1 cm path length cuvette. Absorbance was linearly related to cell number up to an OD. of 2.0.

Saccharomyces cerevisiae strains Mey 134 and CLS2-13 were maintained on Yeast peptone dextrose (YPD) agar plates at 30° C., which were subcultured biweekly. For the growth of liquid cultures for experiments, the S. cerevisiae strains were grown on YPD agar for 48 h at 30° C. and were then used to inoculate 50 ml YPD broth containing 500 μg/l d-biotin, which was incubated at 30° C. for 16h on a platform shaker (200 rpm). 2.0 ml of this culture (approx. 4×10⁸ cfu/ml) was added to each of 24×2 litre conical flasks, each containing 1 litre of YPD broth containing 500 μg/l d-biotin, giving a final inoculum concentration of approximately 8×10⁵ cfu/ml. The cultures were grown for 9 h, at 30° C. (log phase) with shaking (200 rpm). Cell numbers in liquid culture were determined spectrophotometrically (Philips PU8630 UV/VIS/NIR Spectrophotometer) at 540 nm in a 1 cm path length cuvette.

Saccharomyces cerevisiae strains PNS117a 5C, PNS117b 6A, and PNS120a 6C were maintained on Yeast peptone galactose (YPGal) agar plates at 30° C. which were subcultured biweekly. For the growth of liquid cultures for experiments, the S. cerevisiae strains were grown on YPGal agar for 48 h at 30° C. and were then used to inoculate 50 ml YPGal broth containing 500 μg/l d-biotin and 200 μg/ml kanomycin, which were incubated at 30° C. for 30h on a platform shaker (200 rpm). 2.0 ml of this culture (approx. 4×10⁸ cfu/ml) was added to each of 24×2 litre conical flasks, each containing 1 litre of YPGal broth containing 500 μg/l d-biotin and 200 μg/ml kanomycin, giving a final inoculum concentration of approximately 8×10⁵ cfu/ml. The cultures were grown for approximately 23h at 30° C. (log phase) with shaking (200 rpm).

Determination of Cell Number

Cell numbers were determined using a standard viable count agar based plating method, using the appropriate agar media.

Preparation of Fungal ACCase Enzyme

Cultures of the appropriate yeast strains were grown to the exponential phase of growth (for Saccharomyces and Candida strains respectively). These were then harvested by centrifugation (4400 g, 10 min, 4° C.), washed twice in 700 ml of 50 mM Tris pH7.5 containing 20% w/v gylcerol, resuspending the cell pellet each time. The final washed pellet was fully resuspended into a thick slurry using 10 to 20ml of buffer (50 mM Tris pH7.5 containing 1 mM EGTA, 1 mM EDTA (disodium salt), 1 mM DTT, 0.25mM Pefabloc hydrochloride, 1 μM Leupeptin hemisulphate, 1 μM Pepstatin A, 0.5 μM Trypsin inhibitor and 20% w/v glycerol). The volume of buffer required was dependent on the total packed cell wet weight. (i.e. 1 ml buffer added per 6 gm of packed wet cell pellet).

The cell paste was homogenised using a pre-cooled Bead-Beater (Biospec Products, Bartlesville, Okla. 74005) with 4×10 second Bursts, allowing 20 second intervals on ice. The preparation was then centrifuged at 31,180 g for 30 minutes. After centrifugation the supernatant was immediately decanted into a container, then aliquoted before snap freezing in liquid nitrogen. The preparation was then stored at −80° C. and was found to be stable for at least 2 months.

All enzyme preparation steps were carried out at +4° C., unless otherwise stated.

In-vitro ACCase Assay

The assay was conducted in 96 well, flat bottomed polystyrene microtitre plates. All test and control samples were tested in duplicate in this assay.

100 μl of the ACCase enzyme preparation (in 50 mM Tris pH7.5 containing 1 mM EGTA, 1 mM EDTA (disodium salt), 1 mM DTT, 0.25 mM Pefabloc hydrochloride, 1 μM Leupeptin hemisulphate, 1 μM Pepstatin A, 0.5 μM Trypsin inhibitor, and 20% w/v glycerol) was added to each well of the microtitre plate. Each well contained either a 3 μl test sample made up in DMSO or 3 μl DMSO alone (NB. Final DMSO concentrations in the assay were 1.48% v/v). The microtitre plates were placed in a water bath maintained at 37° C. 10 μl of [¹⁴C] NaHCO₃ containing 9.25 kBq in 378 mM NaHCO₃ was then added to each well. The reaction was initiated by the addition of 100 μl of Acetyl Coenzyme A containing assay buffer (50 mM Tris pH7.5 containing 4.41 mM ATP(disodium salt), 2.1 mM Acetyl Coenzyme A, 2.52 mM DTT, 10.5 mM MgCl₂, and 0.21% w/v Albumin [Bovine, fraction V]), (removed from ice 5 minutes before use) to each well. The tubes were incubated at 37° C. for 5 minutes. The reaction was then terminated by the addition of 50 μl of 6M HCl to each well. In parallel, a pre-stopped assay control was set up which involved adding the 50 μl of 6M HCl prior to [⁴C] NaHCO₃ and the assay buffer (No further HCl additions were made to these wells after the 5 minute incubation). The DPM values for the pre-stopped assay were subtracted from the normal assay situation.

After the addition of the stop reagent the plates were left open in the water bath for a further 30 minutes to allow the ¹⁴CO₂ to escape. After this time 150 μl of each reaction mixture were applied onto individual GF/C glass microfibre filter discs and allowed to dry thoroughly before adding scintillation fluid. Radioactivity in the samples was then determined by scintillation counting (Wallac WinSpectral 1414, Turku, Finland).

IC50's were calculated from the data using non-linear regression techniques available in the ORIGIN software package (Microcal Software Inc., Massachusetts, USA). Soraphen A which is a specific inhibitor of ACCase was supplied over the range 0.1 nM-100 μM in the dose response regimen of the assay.

Protein Determination

The total protein concentration of each ACCase preparation used was determined by the Coomasie Blue method (Pierce, Ill., USA), (using 1 cm path length cuvettes read 595 nm (Philips PU8630 UV/VIS/NIR Spectrophotometer).

In-vitro Antifungal Activity

Compounds were tested over a concentration range of 1024-0.00098 μg/ml by a broth-dilution method in microtitre plates using doubling dilutions in YPD or YPGal (both containing 500 μg/l d-biotin). Stock solutions of inhibitors were prepared at 51.2 mg/ml in Dimethyl sulphoxide (DMSO) (final assay concentration of DMSO was 2% v/v). Each Yeast culture was added to the well to give a final 10⁴ cfu/well. The plates were incubated at 30° C. for 48h and MIC's determined visually.

Discussion

Expression of ACCase, a biotinylated protein, was monitored by a “biotin-avidin affinity western blot” as described by Hal3lacher et al., 1993. Expression of the C. albicans ACC1 gene from its own promoter from plasmid Yep24 was comparable to that of the S. cerevisiae gene (no overexpression). Expression under control of the GAL1 promoter however, was considerably higher indicating a drastically increased level of biotinylated and therefore fully functional enzyme. Transcription of the gene was fully induced as the cells had to be grown on galactose to be viable. On glucose the GAL1 promoter is completely off, causing the cells to arrest and eventually die due to insufficient supply of ACCase). The S. cerevisiae strain described in this application is a convenient source of the C. albicans enzyme. The engineered strain possesses no residual background ACCase because the gene coding for the S. cerevisiae enzyme had been removed. Congenic versions of such a strain (genetically identical apart from the ACCase gene carried) expressing different ACCases (e.g. the different human (Abu-Elheiga et al. 1995), mammalian (Lopez-Casillas et al., 1988, Takai et al. 1988, Barber et al., 1995)), plant (Schulte et al., 1994) or other fitmgal enzymes (Al-Feel et al., 1992, Saito et al., 1996, Bailey et al., 1995)) can be used as tools for screening. Differences in growth of such strains may be solely dependent on differences in their ACCase activity. Differential growth in the presence of ACCase inhibitors (for example soraphenA or compounds yet to be identified) indicates selectivity of the drug towards one type of the ACCase enzyme.

References

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TABLE 1 Comparative properties of native and recombinant acetyl-CoA carboxylase enzymes Specific activity IC50 for of ACCase Growth Soraphen A preparation Cell temperature Liquid MIC (nM) (nmoles doubling for ACCase (μg/ml) against product/ time preparation for ACCase min/mg Yeast strain (minutes) (° C.) Soraphen A preparations protein) C. albicans 56 37 0.003 B2630 S. cerevisiae Mey 160 30 8 0.641 134 S. cerevisiae 163 30 2  2.499 3.054 CLS2-13 S. cerevisiae PNS 253 30 2 17.518 7.025 117a 5C S. cerevisiae PNS 222 30 4 13.083 10.573  117b 6A S. cerevisiae PNS 303 30 0.5 ND 0.244 120a 6C S. cerevisiae PNS 287 30 0.125 ND ND 120b 1C Key: ND = not determined

3 1 523 DNA Candida albicans 1 gcacgcttga cggttttcac caaatgcgaa aatatgacca aattgagaat ccgaaaatga 60 atggatagaa gattggttac caactgagaa ataaccccac acattagaag aagaacggaa 120 attcaattca tgtaaagaac caccacttgg tttaaaacct tcaccaggat cttcagaagt 180 aatacgacaa gcagtacaat gtccctttgg tgttggtctt ctttgactaa ccaatgaagt 240 ttctgacttg aattcaaaat caatatcagt agtggtatga ggatcggcac cgcacaaagt 300 tctgatatct ctgattctat gcattggtat acccatagca atttgtaatt gagcagctgg 360 taaattaaca cctgtcacca tttcagtggt tggatgttca acttgcaatc ttgggttcaa 420 ttccaaaaag tagaatttat cttcagcgtg gggagtaaag gtactcaaca gtaccagggg 480 gttacataac caacttattt tacccaatct gactggtgga ttt 523 2 8054 DNA Candida albicans 2 aatatattgc ttccttttga taggaagtaa ctccgagtgt ttgaatttga tatatgttat 60 tcatatacgt tcaatggctc tcttctatgc tttgtatata ctttcttttg aatagatact 120 catgtaaaga gatttgaaac catattctaa ccaacaaaaa tattgtacgg tataggttag 180 aaaaaaaact ccgtaaggtc cgcttacacg gttaaattga aaacacgtta aaaatatatt 240 tgggtaatgg actaagctat atacagtact caacaaaaat gaaatcaaac acaatgttct 300 ttgggaaatt catttcatgc aactagggtg attctctttc tactatccaa caacgataac 360 cctgcttttg aaaaatcttt tctaaattca aattgatata attcttattt atatattact 420 ttctttttcc catataaccc catttttttt ttggaatcat atttgttttt gatttttgct 480 ttccctttca gtctgaggaa catactaatt acgaacaaca attatacatc caatcttcat 540 ctaacgaatt gattatttac atttattaaa cccttggata caaactgatt acacttttta 600 gttagtttgt tcaattataa gggtattata caacaaagat atcatttaaa gttaaatctc 660 aatctggaat aataaaagta ttcaacactt ttgcttacaa taggtatgtt caaaatcaat 720 tgaagccatc gagataagaa attaagcaaa aacgtttaca attgttgtgt gtgtgttgca 780 gtgtttgaag aagctcgagt gattgctttt cttcggcatc agctgtgttg ggaacatctt 840 gtcgttaaag tttcggagta atattagagt aatggaacga aaaaaacaaa ataaagttct 900 ggaaccacaa agatttgaaa aattgggtag aaacaaaaaa aagacaaagc aggaacccaa 960 caataaatga ataaacactc aaaaactact cacaacaaca acacttattt tcacttgctt 1020 tatttcttcg attttttatg agatgcaaat tatctctaat aaagaatact aactcacttg 1080 tacatagatc gcgtttccta attacaaaac cacaactata tatacctcat cgtcattata 1140 tcccattcaa gaacatattc aagtcattgt taatgtcaga tcaatctcca tctcctagtc 1200 ctagcgattc ccttagctac actacattac atgaaaattt gccatctcat ttcttgggtg 1260 gaaattcagt tttgaatgct gaaccttcta aagtcagaga ctttgtcaga gctcatcaag 1320 gtcatacagt tatttcgaaa attttaattg ccaacaatgg tatagctgca gttaaagaaa 1380 tcagatcagt tagaaaatgg gcttatgaaa catttggtga cgaaaaagcc atacagttta 1440 ccgttatggc cactccagaa gatttggaag ctaatgccga atatattaga atggccgacc 1500 aattcattga agtccctggt ggcaccaata acaataacta tgctaatgtt gatctcattg 1560 tagagatagc agaaagtaca aatgctcatg ccgtttgggc tgggtggggg catgcttcag 1620 agaatccttt gttaccagaa aaattagctg catctcccaa aaaaattatt tttattggtc 1680 ctcctggttc agctatgaga tctttaggtg acaagatttc atctactata gttgctcaac 1740 atgctcaagt accatgtatt ccatggtccg gtactggtgt tgatgaagtg aaaatagacc 1800 cacaaactaa tttggtttct gttgctgatg atatttatgc caaagggtgc tgtactagtc 1860 cagaagatgg tttagaaaaa gccaaaaaaa ttgggttccc agttatgatt aaagcctctg 1920 aaggtggtgg tggtaaaggt attagaaaag ttgatgatga gaaaaacttc attaccttat 1980 acaaccaagc agctaatgaa ataccaggtt ctcctatctt tattatgaag ttagcaggtg 2040 atgccagaca tttagaagtt caattactag cagatcaata cggtactaac atttcccttt 2100 ttggaagaga ttgttccgta caaagaagac accaaaagat tattgaagaa gcaccagtca 2160 ccattgccag aaaggaaact ttccacgaaa tggaaaatgc agcagtcaga ttgggtaaat 2220 tagttggtta tgtatccgct ggtactgttg agtatcttta ctcccacgct gaagataaat 2280 tctacttttt ggaattgaac ccaagattgc aagttgaaca tccaaccact gaaatggtga 2340 caggtgttaa tttaccagct gctcaattac aaattgctat gggtatacca atgcatagaa 2400 tcagagatat cagaactttg tacggtgccg atcctcatac cactactgat attgattttg 2460 aattcaagtc agaaacttca ttggttagtc aaagaagacc aacaccaaag ggacattgta 2520 ctgcttgtcg tattacttct gaagatcctg gtgaaggttt taaaccaagt ggtggttctt 2580 tacatgaatt gaatttccgt tcttcttcta atgtgtgggg ttatttctca gttggtaacc 2640 aatcttctat ccattcattt tcggattctc aatttggtca tattttcgca tttggtgaaa 2700 accgtcaagc ttcaagaaaa catatggttg ttgccttgaa agaattgagt attagaggtg 2760 attttagaac tactgttgag tatttaatca aattgttaga aactccagat ttcgaggata 2820 ataccattac aactggttgg ttggatgaat taatcaccaa aaagttgact gctgaaagac 2880 cagatccaat agttgctgtt gtttgtggag ctgtaaccaa agcacacatc caggctgagg 2940 aagagaaaaa ggaatacatc caatctttgg aaaaaggtca agttcctcac agaaacttat 3000 tgaaaactat tttcccagtt gagtttattt atgaaggtga aagatacaag ttcactgcta 3060 ctaaatcttc agaagataaa tatactttgt tccttaatgg ttctcgttgt gttgttggtg 3120 cacgttcatt gtccgatggt ggtttattgt gtgcattaga tgggaaatca cattctgtct 3180 attggaagga agaggcatct gccactagat tatcagttga tggcaaaact tgtttattag 3240 aagttgaaaa tgatccaaca caattaagaa ctccatctcc aggtaaattg gtcaagtatt 3300 tggttgacag tggtgaacat gttgatgctg gtcaaccata cgctgaagtc gaagttatga 3360 aaatgtgtat gcctttgatt gctcaagaaa atggggtagt gcagttgatt aaacaaccgg 3420 gttccacagt taatgctggt gatatcttgg ccattttggc attggacgat ccatctaagg 3480 tcaaacatgc taaaccattt gaaggtactt taccatctat gggtgagcca aatgttacag 3540 gtactaaacc agcacataaa ttcaatcatt gtgctggtat tttgaaaaac attttggctg 3600 gttatgataa tcaagtgatt ttgaattcta ctttaaagag tcttggtgaa gttttgaaag 3660 acaatgaatt gccatactct gaatggcaac aacaaatttc agctttacac tccagattgc 3720 cacctaaatt ggatgacgga ttgactgcat tggttgaaag aactcaaagt agaggtgctg 3780 aattccctgc tcgtcaaatt ttaaaactca tcaccaaatc aattgctgaa aatggtaatg 3840 atatgttaga agatgttgtt gcaccattgg tttctattgc cacaagttac cagaatggtt 3900 tggttgaaca cgaatacgat tactttgcat ctttgattaa cgaatattat gacgttgaaa 3960 gtttgttttc aggtgaaaat gttagagaag ataatgttat cttgaaatta agagatgaaa 4020 acaaatctga tttgaaaaaa gttattggta ttggtttgtc tcattcacgt gttagtgcca 4080 agaacaattt gattttagct attttggaca tttatgaacc attgttgcaa tccaactcgt 4140 cagttgctgc ctctatcaga gaagctttaa agaacttgtt cattagacct cgtgcttgtg 4200 ccaaagttgc attaaaggca agagaaattt taattcaatg ttctttacct tccatcaagg 4260 aaagatccga tcaattggaa catattttga ggtcatctgt tgttcaaacc tcttatggtg 4320 aaatttttgc taaacataga gaaccaaatt tggaaattat tcgtgaggtt gttgattcca 4380 aacatattgt ttttgatgtg ttggcacaat tcttaatcaa tccagaccca tgggttgcca 4440 ttgctgccgc tgaagtttat gtcagacgtt cataccgtgc ttatgatttg ggtaaaattg 4500 aatatcatgt taatgacaga cttcctattg ttgaatggaa attcaagttg gctaatatgg 4560 gagccgctgg tgtaaacgat gctcaacagg ctgctgctgc cggtggcgat gattcgacat 4620 ctatgaaaca tgcagcttct gtgtctgatt tgacctttgt tgttgattct aaaaccgagc 4680 attccacaag aactggtgtt ttagctccag caagacactt ggatgatgtt gatgaaactc 4740 ttacagctgc attggaacaa ttccaaccag ccgatgctat ttcatttaaa gcaaagggtg 4800 aaactccaga gttattaaat gttttgaata ttgtcattac cagtattgat ggttactccg 4860 atgaaaatga atacttgagc agaattaatg aaatcttgtg cgaatacaaa gaagagttga 4920 tttctgctgg tgttcgtcgt gttacatttg tttttgctca tcaaattggt caatatccta 4980 aatattatac ttttactggt cctgactatg aagaaaacaa ggttattaga cacattgaac 5040 cagctttggc tttccaattg gaattgggaa gattagccaa tttcgatatc aaaccaattt 5100 tcactaacaa cagaaacatc catgtatatg atgcaattgg gaagaatgct ccttctgata 5160 aaagattttt caccagaggg attattagaa ccggtgttct taaagaagac attagcatta 5220 gtgaatattt gattgctgaa tccaacagat taatgaatga tattttggat actttagaag 5280 ttattgacac ttctaattct gatttaaacc atattttcat taacttttcc aatgctttca 5340 atgttcaagc ttcagatgtt gaggctgcct ttggatcatt cttagaaaga tttggtagaa 5400 gattatggag attaagagtt actggtgctg aaattagaat tgtctgtact gatcctcaag 5460 gtacttcgtt cccattgcgt gctatcatta ataatgtttc tggttatgtt gtcaaatcag 5520 aattgtattt ggaagtgaaa aatcctaaag gtgaatgggt tttcaaatcc attggtcatc 5580 ctggttccat gcatttgaga cctatctcaa ctccatatcc agttaaagaa tctttacaac 5640 caaaacgtta caaggctcac aatatgggta ccacttatgt gtatgacttc ccagaattgt 5700 ttcgtcaagc aacaatttca caatggaaaa aatatggcaa aaaagtacca aaagatgttt 5760 tcgtgtcttt agaattgatc actgatgaaa ctgattcctt aatagctgtt gaaagagatc 5820 cgggtgctaa caaaattgga atggttggat tcaaagtcac tgctaaaact cctgaatacc 5880 ctcatggtcg tcaattaatt attgttgcca atgatatcac ccacaagatt ggttcttttg 5940 gtccagaaga agataattat ttcaacaagt gtactgaatt ggccagaaaa ttaggtattc 6000 caagaattta cctttctgca aattcaggtg ctagaattgg tgttgctgag gaattgattc 6060 cattatacca agttgcctgg aatgaagaag ggtctcctga caaaggattc agatacttgt 6120 acttgagtac tgctgctaaa gagtctttag aaaaagatgg taaaagtgac agtgttgtta 6180 ctgaacgtat tgttgaaaaa ggtgaagagc gtcatgtcat taaagctatt attggtgccg 6240 aagatggctt aggggttgaa tgtcttaaag gatcaggttt aattgctggt gccacatcaa 6300 gagcttacaa ggatatattt accatcactt tggtaacttg tagatctgtt ggtattggtg 6360 cttatttggt tagattgggt caaagagcca ttcaaatcga tggtcaacct attattttaa 6420 ctggtgctcc tgctatcaat aaattgttgg gtagagaagt gtattcttcc aatcttcaat 6480 tgggtggtac tcaaatcatg tacaataatg gtgtttctca tttgacagct aatgatgatt 6540 tggctggggt tgaaaaaatt atggaatggt tatcatatgt tccagctaaa cgtggtttac 6600 cagtgccaat tttggaatca gaagattctt gggacagaga tgttgattac tacccaccaa 6660 aacaagaagc ttttgatgtt agatggatga tccaaggtag agaagttgat ggtgaatatg 6720 aatctgggtt atttgataaa gattcattcc aagaaacatt atctggttgg gctaaaggtg 6780 ttgttgttgg tagagcacgt ttgggtggta ttccaattgg tgttattggt gtcgaaacca 6840 gaacagtgga aaacttgatt cctgctgatc cagcaaatcc agactctaca gaaagtttga 6900 ttcaagaagc aggtcaagtg tggtatccta actctgcttt taagacagca caagctataa 6960 atgatttcaa caatggtgaa caattgccat taatgatttt agcaaattgg agaggtttct 7020 ctggtggtca aagagatatg tacaatgaag tcttgaaata tggttcattt attgttgatg 7080 ctttagttga cttcaagcaa cctatcttca cttacattcc accaaatgga gaattgagag 7140 gtggctcttg ggttgttgtt gatccaacca tcaactcaga tatgatggaa atgtatgccg 7200 atgtcgattc gagagctggt gttttggaac cagaaggtat ggttggtatc aaatacagac 7260 gtgataaatt attagcaact atggaaagat tagatccaac ttatggtgaa atgaaagcta 7320 agttaaatga ctcgtcatta tctccagaag aacactcgaa aataagcgcc aaattgtttg 7380 cacgtgaaaa ggctttatta ccaatttatg ctcaaatttc cgttcaattt gctgacttgc 7440 acgatagatc aggtcgtatg ttggccaagg gagttattag aaaggaaatc aaatggactg 7500 atgctagacg tttcttcttc tggagattga gaagaagatt gaacgaggaa tatgttttga 7560 gattgattag tgaacaaatt aaagattcta gcaaattgga aagagttgcc agattgaaga 7620 gttggatgcc aactgttgaa tacgatgatg accaagctgt cagtaactgg attgaagaga 7680 accatgccaa attgcaaaag agagttaatg aattgaaaca agaagtttca agaaccaaga 7740 ttatgagatt attaaaagag gatccaaata gtgcaatttc tgcaatgaaa gactatgttg 7800 aaagattgtc aaaagaagat aaagagaaat tcctcaaggc attgaagtag aagtggtttc 7860 cattaattca actttttaat gacattgaaa gtagtagtag ttgttgtttt ttagatttaa 7920 gtatattata ttatgtaata aattatagaa agtaattata gttttgacgg ttaattgacg 7980 agagtgggaa attggctttt ttgttgctcg tgtgatgaaa cagtgattga cacaaaaaaa 8040 tagacaatga aaac 8054 3 2270 PRT Candida albicans 3 Met Arg Cys Lys Leu Ser Leu Ile Lys Asn Thr Asn Ser Leu Val His 1 5 10 15 Arg Ser Arg Phe Leu Ile Thr Lys Pro Gln Leu Tyr Ile Pro His Arg 20 25 30 His Tyr Ile Pro Phe Lys Asn Ile Phe Lys Ser Leu Leu Met Ser Asp 35 40 45 Gln Ser Pro Ser Pro Ser Pro Ser Asp Ser Leu Ser Tyr Thr Thr Leu 50 55 60 His Glu Asn Leu Pro Ser His Phe Leu Gly Gly Asn Ser Val Leu Asn 65 70 75 80 Ala Glu Pro Ser Lys Val Arg Asp Phe Val Arg Ala His Gln Gly His 85 90 95 Thr Val Ile Ser Lys Ile Leu Ile Ala Asn Asn Gly Ile Ala Ala Val 100 105 110 Lys Glu Ile Arg Ser Val Arg Lys Trp Ala Tyr Glu Thr Phe Gly Asp 115 120 125 Glu Lys Ala Ile Gln Phe Thr Val Met Ala Thr Pro Glu Asp Leu Glu 130 135 140 Ala Asn Ala Glu Tyr Ile Arg Met Ala Asp Gln Phe Ile Glu Val Pro 145 150 155 160 Gly Gly Thr Asn Asn Asn Asn Tyr Ala Asn Val Asp Leu Ile Val Glu 165 170 175 Ile Ala Glu Ser Thr Asn Ala His Ala Val Trp Ala Gly Trp Gly His 180 185 190 Ala Ser Glu Asn Pro Leu Leu Pro Glu Lys Leu Ala Ala Ser Pro Lys 195 200 205 Lys Ile Ile Phe Ile Gly Pro Pro Gly Ser Ala Met Arg Ser Leu Gly 210 215 220 Asp Lys Ile Ser Ser Thr Ile Val Ala Gln His Ala Gln Val Pro Cys 225 230 235 240 Ile Pro Trp Ser Gly Thr Gly Val Asp Glu Val Lys Ile Asp Pro Gln 245 250 255 Thr Asn Leu Val Ser Val Ala Asp Asp Ile Tyr Ala Lys Gly Cys Cys 260 265 270 Thr Ser Pro Glu Asp Gly Leu Glu Lys Ala Lys Lys Ile Gly Phe Pro 275 280 285 Val Met Ile Lys Ala Ser Glu Gly Gly Gly Gly Lys Gly Ile Arg Lys 290 295 300 Val Asp Asp Glu Lys Asn Phe Ile Thr Leu Tyr Asn Gln Ala Ala Asn 305 310 315 320 Glu Ile Pro Gly Ser Pro Ile Phe Ile Met Lys Leu Ala Gly Asp Ala 325 330 335 Arg His Leu Glu Val Gln Leu Leu Ala Asp Gln Tyr Gly Thr Asn Ile 340 345 350 Ser Leu Phe Gly Arg Asp Cys Ser Val Gln Arg Arg His Gln Lys Ile 355 360 365 Ile Glu Glu Ala Pro Val Thr Ile Ala Arg Lys Glu Thr Phe His Glu 370 375 380 Met Glu Asn Ala Ala Val Arg Leu Gly Lys Leu Val Gly Tyr Val Ser 385 390 395 400 Ala Gly Thr Val Glu Tyr Leu Tyr Ser His Ala Glu Asp Lys Phe Tyr 405 410 415 Phe Leu Glu Leu Asn Pro Arg Leu Gln Val Glu His Pro Thr Thr Glu 420 425 430 Met Val Thr Gly Val Asn Leu Pro Ala Ala Gln Leu Gln Ile Ala Met 435 440 445 Gly Ile Pro Met His Arg Ile Arg Asp Ile Arg Thr Leu Tyr Gly Ala 450 455 460 Asp Pro His Thr Thr Thr Asp Ile Asp Phe Glu Phe Lys Ser Glu Thr 465 470 475 480 Ser Leu Val Ser Gln Arg Arg Pro Thr Pro Lys Gly His Cys Thr Ala 485 490 495 Cys Arg Ile Thr Ser Glu Asp Pro Gly Glu Gly Phe Lys Pro Ser Gly 500 505 510 Gly Ser Leu His Glu Leu Asn Phe Arg Ser Ser Ser Asn Val Trp Gly 515 520 525 Tyr Phe Ser Val Gly Asn Gln Ser Ser Ile His Ser Phe Ser Asp Ser 530 535 540 Gln Phe Gly His Ile Phe Ala Phe Gly Glu Asn Arg Gln Ala Ser Arg 545 550 555 560 Lys His Met Val Val Ala Leu Lys Glu Leu Ser Ile Arg Gly Asp Phe 565 570 575 Arg Thr Thr Val Glu Tyr Leu Ile Lys Leu Leu Glu Thr Pro Asp Phe 580 585 590 Glu Asp Asn Thr Ile Thr Thr Gly Trp Leu Asp Glu Leu Ile Thr Lys 595 600 605 Lys Leu Thr Ala Glu Arg Pro Asp Pro Ile Val Ala Val Val Cys Gly 610 615 620 Ala Val Thr Lys Ala His Ile Gln Ala Glu Glu Glu Lys Lys Glu Tyr 625 630 635 640 Ile Gln Ser Leu Glu Lys Gly Gln Val Pro His Arg Asn Leu Leu Lys 645 650 655 Thr Ile Phe Pro Val Glu Phe Ile Tyr Glu Gly Glu Arg Tyr Lys Phe 660 665 670 Thr Ala Thr Lys Ser Ser Glu Asp Lys Tyr Thr Leu Phe Leu Asn Gly 675 680 685 Ser Arg Cys Val Val Gly Ala Arg Ser Leu Ser Asp Gly Gly Leu Leu 690 695 700 Cys Ala Leu Asp Gly Lys Ser His Ser Val Tyr Trp Lys Glu Glu Ala 705 710 715 720 Ser Ala Thr Arg Leu Ser Val Asp Gly Lys Thr Cys Leu Leu Glu Val 725 730 735 Glu Asn Asp Pro Thr Gln Leu Arg Thr Pro Ser Pro Gly Lys Leu Val 740 745 750 Lys Tyr Leu Val Asp Ser Gly Glu His Val Asp Ala Gly Gln Pro Tyr 755 760 765 Ala Glu Val Glu Val Met Lys Met Cys Met Pro Leu Ile Ala Gln Glu 770 775 780 Asn Gly Val Val Gln Leu Ile Lys Gln Pro Gly Ser Thr Val Asn Ala 785 790 795 800 Gly Asp Ile Leu Ala Ile Leu Ala Leu Asp Asp Pro Ser Lys Val Lys 805 810 815 His Ala Lys Pro Phe Glu Gly Thr Leu Pro Ser Met Gly Glu Pro Asn 820 825 830 Val Thr Gly Thr Lys Pro Ala His Lys Phe Asn His Cys Ala Gly Ile 835 840 845 Leu Lys Asn Ile Leu Ala Gly Tyr Asp Asn Gln Val Ile Leu Asn Ser 850 855 860 Thr Leu Lys Ser Leu Gly Glu Val Leu Lys Asp Asn Glu Leu Pro Tyr 865 870 875 880 Ser Glu Trp Gln Gln Gln Ile Ser Ala Leu His Ser Arg Leu Pro Pro 885 890 895 Lys Leu Asp Asp Gly Leu Thr Ala Leu Val Glu Arg Thr Gln Ser Arg 900 905 910 Gly Ala Glu Phe Pro Ala Arg Gln Ile Leu Lys Leu Ile Thr Lys Ser 915 920 925 Ile Ala Glu Asn Gly Asn Asp Met Leu Glu Asp Val Val Ala Pro Leu 930 935 940 Val Ser Ile Ala Thr Ser Tyr Gln Asn Gly Leu Val Glu His Glu Tyr 945 950 955 960 Asp Tyr Phe Ala Ser Leu Ile Asn Glu Tyr Tyr Asp Val Glu Ser Leu 965 970 975 Phe Ser Gly Glu Asn Val Arg Glu Asp Asn Val Ile Leu Lys Leu Arg 980 985 990 Asp Glu Asn Lys Ser Asp Leu Lys Lys Val Ile Gly Ile Gly Leu Ser 995 1000 1005 His Ser Arg Val Ser Ala Lys Asn Asn Leu Ile Leu Ala Ile Leu Asp 1010 1015 1020 Ile Tyr Glu Pro Leu Leu Gln Ser Asn Ser Ser Val Ala Ala Ser Ile 1025 1030 1035 1040 Arg Glu Ala Leu Lys Asn Leu Phe Ile Arg Pro Arg Ala Cys Ala Lys 1045 1050 1055 Val Ala Leu Lys Ala Arg Glu Ile Leu Ile Gln Cys Ser Leu Pro Ser 1060 1065 1070 Ile Lys Glu Arg Ser Asp Gln Leu Glu His Ile Leu Arg Ser Ser Val 1075 1080 1085 Val Gln Thr Ser Tyr Gly Glu Ile Phe Ala Lys His Arg Glu Pro Asn 1090 1095 1100 Leu Glu Ile Ile Arg Glu Val Val Asp Ser Lys His Ile Val Phe Asp 1105 1110 1115 1120 Val Leu Ala Gln Phe Leu Ile Asn Pro Asp Pro Trp Val Ala Ile Ala 1125 1130 1135 Ala Ala Glu Val Tyr Val Arg Arg Ser Tyr Arg Ala Tyr Asp Leu Gly 1140 1145 1150 Lys Ile Glu Tyr His Val Asn Asp Arg Leu Pro Ile Val Glu Trp Lys 1155 1160 1165 Phe Lys Leu Ala Asn Met Gly Ala Ala Gly Val Asn Asp Ala Gln Gln 1170 1175 1180 Ala Ala Ala Ala Gly Gly Asp Asp Ser Thr Ser Met Lys His Ala Ala 1185 1190 1195 1200 Ser Val Ser Asp Leu Thr Phe Val Val Asp Ser Lys Thr Glu His Ser 1205 1210 1215 Thr Arg Thr Gly Val Leu Ala Pro Ala Arg His Leu Asp Asp Val Asp 1220 1225 1230 Glu Thr Leu Thr Ala Ala Leu Glu Gln Phe Gln Pro Ala Asp Ala Ile 1235 1240 1245 Ser Phe Lys Ala Lys Gly Glu Thr Pro Glu Leu Leu Asn Val Leu Asn 1250 1255 1260 Ile Val Ile Thr Ser Ile Asp Gly Tyr Ser Asp Glu Asn Glu Tyr Leu 1265 1270 1275 1280 Ser Arg Ile Asn Glu Ile Leu Cys Glu Tyr Lys Glu Glu Leu Ile Ser 1285 1290 1295 Ala Gly Val Arg Arg Val Thr Phe Val Phe Ala His Gln Ile Gly Gln 1300 1305 1310 Tyr Pro Lys Tyr Tyr Thr Phe Thr Gly Pro Asp Tyr Glu Glu Asn Lys 1315 1320 1325 Val Ile Arg His Ile Glu Pro Ala Leu Ala Phe Gln Leu Glu Leu Gly 1330 1335 1340 Arg Leu Ala Asn Phe Asp Ile Lys Pro Ile Phe Thr Asn Asn Arg Asn 1345 1350 1355 1360 Ile His Val Tyr Asp Ala Ile Gly Lys Asn Ala Pro Ser Asp Lys Arg 1365 1370 1375 Phe Phe Thr Arg Gly Ile Ile Arg Thr Gly Val Leu Lys Glu Asp Ile 1380 1385 1390 Ser Ile Ser Glu Tyr Leu Ile Ala Glu Ser Asn Arg Leu Met Asn Asp 1395 1400 1405 Ile Leu Asp Thr Leu Glu Val Ile Asp Thr Ser Asn Ser Asp Leu Asn 1410 1415 1420 His Ile Phe Ile Asn Phe Ser Asn Ala Phe Asn Val Gln Ala Ser Asp 1425 1430 1435 1440 Val Glu Ala Ala Phe Gly Ser Phe Leu Glu Arg Phe Gly Arg Arg Leu 1445 1450 1455 Trp Arg Leu Arg Val Thr Gly Ala Glu Ile Arg Ile Val Cys Thr Asp 1460 1465 1470 Pro Gln Gly Thr Ser Phe Pro Leu Arg Ala Ile Ile Asn Asn Val Ser 1475 1480 1485 Gly Tyr Val Val Lys Ser Glu Leu Tyr Leu Glu Val Lys Asn Pro Lys 1490 1495 1500 Gly Glu Trp Val Phe Lys Ser Ile Gly His Pro Gly Ser Met His Leu 1505 1510 1515 1520 Arg Pro Ile Ser Thr Pro Tyr Pro Val Lys Glu Ser Leu Gln Pro Lys 1525 1530 1535 Arg Tyr Lys Ala His Asn Met Gly Thr Thr Tyr Val Tyr Asp Phe Pro 1540 1545 1550 Glu Leu Phe Arg Gln Ala Thr Ile Ser Gln Trp Lys Lys Tyr Gly Lys 1555 1560 1565 Lys Val Pro Lys Asp Val Phe Val Ser Leu Glu Leu Ile Thr Asp Glu 1570 1575 1580 Thr Asp Ser Leu Ile Ala Val Glu Arg Asp Pro Gly Ala Asn Lys Ile 1585 1590 1595 1600 Gly Met Val Gly Phe Lys Val Thr Ala Lys Thr Pro Glu Tyr Pro His 1605 1610 1615 Gly Arg Gln Leu Ile Ile Val Ala Asn Asp Ile Thr His Lys Ile Gly 1620 1625 1630 Ser Phe Gly Pro Glu Glu Asp Asn Tyr Phe Asn Lys Cys Thr Glu Leu 1635 1640 1645 Ala Arg Lys Leu Gly Ile Pro Arg Ile Tyr Leu Ser Ala Asn Ser Gly 1650 1655 1660 Ala Arg Ile Gly Val Ala Glu Glu Leu Ile Pro Leu Tyr Gln Val Ala 1665 1670 1675 1680 Trp Asn Glu Glu Gly Ser Pro Asp Lys Gly Phe Arg Tyr Leu Tyr Leu 1685 1690 1695 Ser Thr Ala Ala Lys Glu Ser Leu Glu Lys Asp Gly Lys Ser Asp Ser 1700 1705 1710 Val Val Thr Glu Arg Ile Val Glu Lys Gly Glu Glu Arg His Val Ile 1715 1720 1725 Lys Ala Ile Ile Gly Ala Glu Asp Gly Leu Gly Val Glu Cys Leu Lys 1730 1735 1740 Gly Ser Gly Leu Ile Ala Gly Ala Thr Ser Arg Ala Tyr Lys Asp Ile 1745 1750 1755 1760 Phe Thr Ile Thr Leu Val Thr Cys Arg Ser Val Gly Ile Gly Ala Tyr 1765 1770 1775 Leu Val Arg Leu Gly Gln Arg Ala Ile Gln Ile Asp Gly Gln Pro Ile 1780 1785 1790 Ile Leu Thr Gly Ala Pro Ala Ile Asn Lys Leu Leu Gly Arg Glu Val 1795 1800 1805 Tyr Ser Ser Asn Leu Gln Leu Gly Gly Thr Gln Ile Met Tyr Asn Asn 1810 1815 1820 Gly Val Ser His Leu Thr Ala Asn Asp Asp Leu Ala Gly Val Glu Lys 1825 1830 1835 1840 Ile Met Glu Trp Leu Ser Tyr Val Pro Ala Lys Arg Gly Leu Pro Val 1845 1850 1855 Pro Ile Leu Glu Ser Glu Asp Ser Trp Asp Arg Asp Val Asp Tyr Tyr 1860 1865 1870 Pro Pro Lys Gln Glu Ala Phe Asp Val Arg Trp Met Ile Gln Gly Arg 1875 1880 1885 Glu Val Asp Gly Glu Tyr Glu Ser Gly Leu Phe Asp Lys Asp Ser Phe 1890 1895 1900 Gln Glu Thr Leu Ser Gly Trp Ala Lys Gly Val Val Val Gly Arg Ala 1905 1910 1915 1920 Arg Leu Gly Gly Ile Pro Ile Gly Val Ile Gly Val Glu Thr Arg Thr 1925 1930 1935 Val Glu Asn Leu Ile Pro Ala Asp Pro Ala Asn Pro Asp Ser Thr Glu 1940 1945 1950 Ser Leu Ile Gln Glu Ala Gly Gln Val Trp Tyr Pro Asn Ser Ala Phe 1955 1960 1965 Lys Thr Ala Gln Ala Ile Asn Asp Phe Asn Asn Gly Glu Gln Leu Pro 1970 1975 1980 Leu Met Ile Leu Ala Asn Trp Arg Gly Phe Ser Gly Gly Gln Arg Asp 1985 1990 1995 2000 Met Tyr Asn Glu Val Leu Lys Tyr Gly Ser Phe Ile Val Asp Ala Leu 2005 2010 2015 Val Asp Phe Lys Gln Pro Ile Phe Thr Tyr Ile Pro Pro Asn Gly Glu 2020 2025 2030 Leu Arg Gly Gly Ser Trp Val Val Val Asp Pro Thr Ile Asn Ser Asp 2035 2040 2045 Met Met Glu Met Tyr Ala Asp Val Asp Ser Arg Ala Gly Val Leu Glu 2050 2055 2060 Pro Glu Gly Met Val Gly Ile Lys Tyr Arg Arg Asp Lys Leu Leu Ala 2065 2070 2075 2080 Thr Met Glu Arg Leu Asp Pro Thr Tyr Gly Glu Met Lys Ala Lys Leu 2085 2090 2095 Asn Asp Ser Ser Leu Ser Pro Glu Glu His Ser Lys Ile Ser Ala Lys 2100 2105 2110 Leu Phe Ala Arg Glu Lys Ala Leu Leu Pro Ile Tyr Ala Gln Ile Ser 2115 2120 2125 Val Gln Phe Ala Asp Leu His Asp Arg Ser Gly Arg Met Leu Ala Lys 2130 2135 2140 Gly Val Ile Arg Lys Glu Ile Lys Trp Thr Asp Ala Arg Arg Phe Phe 2145 2150 2155 2160 Phe Trp Arg Leu Arg Arg Arg Leu Asn Glu Glu Tyr Val Leu Arg Leu 2165 2170 2175 Ile Ser Glu Gln Ile Lys Asp Ser Ser Lys Leu Glu Arg Val Ala Arg 2180 2185 2190 Leu Lys Ser Trp Met Pro Thr Val Glu Tyr Asp Asp Asp Gln Ala Val 2195 2200 2205 Ser Asn Trp Ile Glu Glu Asn His Ala Lys Leu Gln Lys Arg Val Asn 2210 2215 2220 Glu Leu Lys Gln Glu Val Ser Arg Thr Lys Ile Met Arg Leu Leu Lys 2225 2230 2235 2240 Glu Asp Pro Asn Ser Ala Ile Ser Ala Met Lys Asp Tyr Val Glu Arg 2245 2250 2255 Leu Ser Lys Glu Asp Lys Glu Lys Phe Leu Lys Ala Leu Lys 2260 2265 2270 

What is claimed is:
 1. An isolated polynucleotide encoding an Acetyl-COA-carboxylase (ACCase) polypeptide defined by SEQ ID NO:3 or amino acid residues 46-2270 of SEQ ID NO: 3, from Candida albicans.
 2. An isolated polynucleotide as claimed in claim 1 and as set out in SEQ ID NO:
 2. 3. An isolated polynucleotide as claimed in claim 2, characterized in that the sequence starts at base number 1173 with the start codon atg2 as set out in SEQ ID NO:
 2. 4. An isolated polynucleotide which comprises nucleotides 1038 to 7847 of SEQ ID NO:2 and is further flanked by Stu1 (5′-end)-Not1 (3′-end) restriction sites.
 5. An isolated polynucleotide which comprises nucleotides 1173 to 7847 of SEQ ID NO:2 and is further flanked by Stu1 (5′-end)-Not1 (3′-end) restriction sites.
 6. An isolated or purified Acetly-COA-carboxylase (ACCase) polypeptide encoded by the polynucleotide of claim
 1. 7. An isolate polynucleotide probe comprising a polynucleotide as claimed in any one of claims 1, 2, 3, 4 and
 5. 8. An Acetyl-COA-carboxylase (ACCase) polypeptide from Candida albicans in isolated and purified form defined by SEQ ID NO:3 or amino acid residues 46-2270 of SEQ ID NO:3 from Candida albicans.
 9. A polypeptide as claimed in claim 8, characterized in that the sequence starts at amino acid number 46 with Met2 as set out in SEQ ID NO:
 3. 10. A polypeptide as claimed in claim 8 and obtained by expression of a polynucleotide as claimed in any one of claims 1, 2, 3, 9 and
 5. 11. An isolated RNA transcript corresponding to a polynucleotide as claimed in any one of claims 1, 2, 3, 9 and
 5. 12. An expression system for expression of an Acetyl-COA-carboxylase (ACCase) polypeptide from Candida albicans, which system comprises an S. cerevisiae host strain having a Candida albicans ACCase-encoding polynucleotide as claimed in any one of claims 1-3 inserted in place of the native ACCase-encoding gene from S. Cerevisiae, whereby the Candida albicans ACC1 polypeptide is expressed.
 13. An expression system as claimed in claim 11, wherein the ACCase polypeptide is expressed using a promoter heterologous with respect to the natural promoter for ACCase in Candida albicans.
 14. An expression system as claimed in claim 13, and used to provide an Acetyl-COA-carboxylase (ACCase) polypeptide from Candida albicans in sufficient quantity and with sufficient activity for compound screening purposes.
 15. Use of an cetyl-COA-carboxylase (ACCase) polypeptide from Candida albicans as claimed in claim 8 in an assay to identify inhibitors of the polypeptide, wherein said assay comprises: (i) isolating an ACCase enzyme preparation comprising the polypeptide of claim 6; (ii) incubating said ACCase enzyme preparation in the presence of a test sample; and (iii) measuring the degree of inhibition of the ACCase enzyme preparation by the test sample.
 16. Use as claimed in claim 15 in pharmaceutical research. polypeptide from Candida albicans.
 17. An expression system as claimed in claim 13, wherein the heterologous promoter is Saccharomyces cerevisiae GAL1.
 18. A method of identifying inhibitors of an enzyme activity of an Acetyl-COA-carboxylase (ACCase) polypeptide from Candida albicans, comprising (i) isolating an Acetyl-COA-carboxylase (ACCase) polypeptide; (ii) contacting said Acetyl-COA-carboxylase (ACCase) polypeptide with a test sample; and (iii) measuring the degree of inhibition of the enzyme activity of said Acetyl-COA-carboxylase (ACCase) polypeptide in the presence of the test sample.
 19. The method of claim 18, wherein said method is conducted as part of pharmaceutical research. 